<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
        <form action="/demo3" method="get">
            <input name="username" placeholder="请输入用户名">
            <input type="submit" value="提交">
            <hr>

            <a href="/day14/requestDemo4">demo4...</a>


        </form>
    </body>
</html>